University of Washington
University Washington: Memory and Learning for Kids
This University of Washington site includes interactive java-based games to test your memory. There are also lots of in-class activities for testing concentration and memory.
Texas Instruments
Texas Instruments: Now You See It, Now You Don't
In this activity, students study the relationship between age and near point accommodation (NPA). They predict a person's age using NPA distance values. They use exponential regression, create box-and-whisker plots and histograms.